Napoleon exile isle (4)
I believe the answer is:
elba
'napoleon exile isle' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elba that I've seen before include "Able was I ere I saw ... (palindrome)" , "Napoleon's first place of exile" , "Island of imperial exile" , "Island of Napoleon's first exile" , "Island of Napoleon's exile in 1814-15" .)